UiPath Extension Mozilla Firefox Error on Open Browser

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1

Hello,

I am new to this Forum and I am currently developing something on a VM on which I don’t have admin rights.

Now to my Issue:

I fetch data from the web and store the link in a DataTable to use it later.
If a certain condition matches the stored Website should open in Firefox.
But If it tries to open the site I get the following Error:

image
image1920×1028 107 KB

  • I checked the extension. Deactivated & Activated it.
  • In IE the site opens - but I can’t use IE.
  • I fetch the data from an open Firefox Browser so the extension should be fine.
  • I work on “Studio 2017.1.6.522 Enterprise Edition”
  • I added the site to trusted Websites.

Edit:

I tested the “Open Browser” with the same site locally and it works fine.
So I guess the VM has some different configs which I can not change.
Thank you,
DM

2

Hi @MaurerDa
If you setup Firefox extension again does it fix the error?

3

Hi,
thanks for responding, but the issue stays the same:

"Main has thrown an exception

Source: Open browser

Message: Cannot communicate with the browser, please check the UiPath extension.

Exception Type: BrowserOperationException

UiPath.Core.BrowserOperationException: Cannot communicate with the browser, please check the UiPath extension. —> System.Runtime.InteropServices.COMException: Cannot communicate with the browser, please check the UiPath extension.
at UiPath.UiBrowserClass.Open(String bstrURL, UiBrowserFlags flag)
at UiPath.Core.Browser.Open(String url, Boolean privateSession, Boolean headlessSession, Boolean defaultSession)
— End of inner exception stack trace —
at UiPath.Core.Activities.ScopeActivity.EndExecute(NativeActivityContext context, IAsyncResult result)
at UiPath.Core.Activities.AsyncNativeActivity.BookmarkResumptionCallback(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkCallbackWrapper.Invoke(NativeActivityContext context, Bookmark bookmark, Object value)
at System.Activities.Runtime.BookmarkWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)"

4

Let’s check together some steps. With Firefox browser open, run UiPath.DiagTool.exe from a console (same folder as UiStudio.exe) and verify that ChromeNativeMessaging.exe is running; You may find this line:
*

  • UIPATH PROCESSES

Name: ChromeNativeMessaging.exe
Path: … \UiPath\BrowserExtension\ChromeNativeMessaging.exe
Arguments: … \AppData\Local\UiPath\uipath-ff.json extension4ff@uipath.com

If this is not found, navigate to AppData\Local\UiPath\uipath-ff.json and check “path” value, it should point to a valid location where ChromeNativeMessaging.exe is located.

Finally, there should be a valid registry pointing to uipath-ff.json at Computer\HKEY_CURRENT_USER\Software\Mozilla\NativeMessagingHosts\com.uipath.chromenativemsg

This info is also explained here Firefox Extension Troubleshooting

5

I tried to run UiPath.DiagTool.exe but it crashed:

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image1920×1030 106 KB

Next i checked the path and location of “ChromeNativeMessaging,exe” and it matches.

And lastly the registry point is valid.

Any more guesses?

6

Please collect low level logs of running the workflow and send me a private message with the .etl file